Mixing & Mastering
Summing is the process of combining multiple audio signals into a single stereo or mono mix. It can be performed digitally within a DAW or using analogue circuitry in a summing mixer to shape the tonal character and depth of the mix.
In audio production, summing refers to the act of blending multiple individual tracks—such as vocals, drums, and instruments—into a single stereo or mono output. In digital systems, this process occurs mathematically within the DAW, maintaining perfect phase accuracy and transparency. However, analogue summing employs resistors, transformers, and op-amps, imparting subtle harmonic coloration and non-linearities that many engineers find musically pleasing.
External analogue summing mixers, such as those made by SSL or SPL, allow mixes to benefit from analogue headroom, warmth, and spatial depth before re-entering the digital domain. The choice between digital and analogue summing often depends on workflow preferences and desired sonic character.
